According to the theory that active galactic nuclei are powered by supermassive black holes, the high luminosity of an active galactic nucleus primarily consists of
A) light emitted by hot gas in an accretion disk that swirls around the black hole.
B) intense radiation emitted by the black hole itself.
C) the combined light of thousands of young, high-mass stars that orbit the black hole.
D) radio waves emitted from radio lobes found on either side of the galaxy we see in visible light.
A
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The mass of ice that can be melted by 1 gram of 100°C steam is (Hint: Don't forget about hot water remaining from condensed steam.)
A) 0.125 gram. B) 0.148 gram. C) 6.75 grams. D) 8 grams. E) none of the above
An electron is moving at 
m/s at an angle of 40
to a 0.80 T magnetic field. What is the magnitude of the acceleration of the electron?
A. 
B. 
C. 
D. 
E. 
A charged particle of mass
kg enters a region of magnetic field at a speed of 
at an angle of 37 degrees relative to the magnetic field direction. If the magnetic field strength is 1.2 T what will be the radius of the helical path it takes?
A. Insufficient information given. B. 15 cm C. 8.9 cm. D. 11 cm
Statistical evidence
a. can be used to draw conclusions about a specific cases. b. is applicable to classes of objects where only a few objects from the class have been studied. c. allows scientists to determine the mechanism that produces the dust ring in Centaurus A. d. allows scientists to deduce general characteristics about a class of objects with similar properties. e. provides insight into the behavior of an individual object based on careful observations of it.